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    <title>Symbolic Math Constants</title>
    <meta name="generator" content="DocBook XSL Stylesheets V1.79.1" />
    <meta name="keywords" content="Symbolic Math Constants" />
  </head>
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    <div class="refentry">
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      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="SymbolicMathConstants"></a>
        <h1>Symbolic Math Constants</h1>
        <p>
             The following symbolic constants are available.
        </p>
      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Built-in Math Constants</h2>
        <p>
          The following symbolic constants are available.  Their values are of type
          <span class="type">float</span> and are accurate within the precision of a single precision
          floating-point number.
        </p>
        <div class="informaltable">
          <table class="informaltable" border="1">
            <colgroup>
              <col align="left" class="col1" />
              <col align="left" class="col2" />
            </colgroup>
            <thead>
              <tr>
                <th align="left">Constant Name</th>
                <th align="left">Description</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left"> MAXFLOAT </td>
                <td align="left">
                            Value of maximum non-infinite single-precision floating-point number.
                        </td>
              </tr>
              <tr>
                <td align="left"> HUGE_VALF </td>
                <td align="left">
                            A positive float constant expression. <code class="constant">HUGE_VALF</code> evaluates to +infinity.
                            Used as an error value returned by the
  <a class="citerefentry" href="mathFunctions.html"><span class="citerefentry"><span class="refentrytitle">built-in math functions</span></span></a>.
                        </td>
              </tr>
              <tr>
                <td align="left"> INFINITY </td>
                <td align="left">
                            A constant expression of type <span class="type">float</span> representing positive or unsigned infinity.
                        </td>
              </tr>
              <tr>
                <td align="left"> NAN </td>
                <td align="left">
                            A constant expression of type <span class="type">float</span> representing a quiet NaN.
                        </td>
              </tr>
            </tbody>
          </table>
        </div>
        <p>
          If double precision is supported by the device, the following symbolic constant will
          also be available:
        </p>
        <div class="informaltable">
          <table class="informaltable" border="1">
            <colgroup>
              <col align="left" class="col1" />
              <col align="left" class="col2" />
            </colgroup>
            <thead>
              <tr>
                <th align="left">Constant Name</th>
                <th align="left">Description</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">
                            HUGE_VAL
                        </td>
                <td align="left">
                            <p>
                              A positive double constant expression. <code class="constant">HUGE_VAL</code>
                              evaluates to +infinity.  Used as an error value returned by the
                              built-in math functions.
                            </p>
                        </td>
              </tr>
            </tbody>
          </table>
        </div>
        <p>
          The following constants are also available. They are of type <span class="type">float</span>
          and are accurate within the precision of the <span class="type">float</span> type.
        </p>
        <div class="informaltable">
          <table class="informaltable" border="1">
            <colgroup>
              <col align="left" class="col1" />
              <col align="left" class="col2" />
            </colgroup>
            <thead>
              <tr>
                <th align="left">Constant Name</th>
                <th align="left">Description</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">M_E_F</td>
                <td align="left">Value of e</td>
              </tr>
              <tr>
                <td align="left">M_LOG2E_F</td>
                <td align="left">Value of log<sub>2</sub>e</td>
              </tr>
              <tr>
                <td align="left">M_LOG10E_F</td>
                <td align="left">Value of log<sub>10</sub>e</td>
              </tr>
              <tr>
                <td align="left">M_LN2_F</td>
                <td align="left">Value of log<sub>e</sub>2</td>
              </tr>
              <tr>
                <td align="left">M_LN10_F</td>
                <td align="left">Value of log<sub>e</sub>10</td>
              </tr>
              <tr>
                <td align="left">M_PI_F</td>
                <td align="left">Value of pi</td>
              </tr>
              <tr>
                <td align="left">M_PI_2_F</td>
                <td align="left">Value of pi / 2</td>
              </tr>
              <tr>
                <td align="left">M_PI_4_F</td>
                <td align="left">Value of pi / 4</td>
              </tr>
              <tr>
                <td align="left">M_1_PI_F</td>
                <td align="left">Value of 1 / pi</td>
              </tr>
              <tr>
                <td align="left">M_2_PI_F</td>
                <td align="left">Value of 2 / pi</td>
              </tr>
              <tr>
                <td align="left">M_2_SQRTPI_F</td>
                <td align="left">Value of 2 / (square root of pi)</td>
              </tr>
              <tr>
                <td align="left">M_SQRT2_F</td>
                <td align="left">Value of square root of 2</td>
              </tr>
              <tr>
                <td align="left">M_SQRT1_2_F</td>
                <td align="left">Value of 1 / (square root of 2)</td>
              </tr>
            </tbody>
          </table>
        </div>
        <p>
          If double precision is supported by the device, the following macros and constants
          are also available. They are of type <span class="type">double</span> and are accurate within the
          precision of the <span class="type">double</span> type.
        </p>
        <div class="informaltable">
          <table class="informaltable" border="1">
            <colgroup>
              <col align="left" class="col1" />
              <col align="left" class="col2" />
            </colgroup>
            <thead>
              <tr>
                <th align="left">Constant Name</th>
                <th align="left">Description</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">M_E</td>
                <td align="left">Value of e</td>
              </tr>
              <tr>
                <td align="left">M_LOG2E</td>
                <td align="left">Value of log<sub>2</sub>e</td>
              </tr>
              <tr>
                <td align="left">M_LOG10E</td>
                <td align="left">Value of log<sub>10</sub>e</td>
              </tr>
              <tr>
                <td align="left">M_LN2</td>
                <td align="left">Value of log<sub>e</sub>2</td>
              </tr>
              <tr>
                <td align="left">M_LN10</td>
                <td align="left">Value of log<sub>e</sub>10</td>
              </tr>
              <tr>
                <td align="left">M_PI</td>
                <td align="left">Value of pi</td>
              </tr>
              <tr>
                <td align="left">M_PI_2</td>
                <td align="left">Value of pi / 2</td>
              </tr>
              <tr>
                <td align="left">M_PI_4</td>
                <td align="left">Value of pi / 4</td>
              </tr>
              <tr>
                <td align="left">M_1_PI</td>
                <td align="left">Value of 1 / pi</td>
              </tr>
              <tr>
                <td align="left">M_2_PI</td>
                <td align="left">Value of 2 / pi</td>
              </tr>
              <tr>
                <td align="left">M_2_SQRTPI</td>
                <td align="left">Value of 2 / (square root of pi)</td>
              </tr>
              <tr>
                <td align="left">M_SQRT2</td>
                <td align="left">Value of square root of 2</td>
              </tr>
              <tr>
                <td align="left">M_SQRT1_2</td>
                <td align="left">Value of 1 / (square root of 2)</td>
              </tr>
            </tbody>
          </table>
        </div>
        <p>
          The following constants are also available. They are of type <span class="type">half</span> and
          are accurate within the precision of the <span class="type">half</span> type.  An application that
          wants to use <span class="type">half</span> and <span class="type">half<em class="replaceable"><code>n</code></em></span>
          types will need to include the <code class="code">#pragma OPENCL EXTENSION
          <a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp16</span></span></a> : enable</code>
          directive.
        </p>
        <div class="informaltable">
          <table class="informaltable" border="1">
            <colgroup>
              <col align="left" class="col1" />
              <col align="left" class="col2" />
            </colgroup>
            <thead>
              <tr>
                <th align="left">Constant</th>
                <th align="left">Description</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">M_E_H</td>
                <td align="left">Value of e</td>
              </tr>
              <tr>
                <td align="left">M_LOG2E_H</td>
                <td align="left">Value of log<sub>2</sub>e</td>
              </tr>
              <tr>
                <td align="left">M_LOG10E_H</td>
                <td align="left">Value of log<sub>10</sub>e</td>
              </tr>
              <tr>
                <td align="left">M_LN2_H</td>
                <td align="left">Value of log<sub>e</sub>2</td>
              </tr>
              <tr>
                <td align="left">M_LN10_H</td>
                <td align="left">Value of log<sub>e</sub>10</td>
              </tr>
              <tr>
                <td align="left">M_PI_H</td>
                <td align="left">Value of pi</td>
              </tr>
              <tr>
                <td align="left">M_PI_2_H</td>
                <td align="left">Value of pi / 2</td>
              </tr>
              <tr>
                <td align="left">M_PI_4_H</td>
                <td align="left">Value of pi / 4</td>
              </tr>
              <tr>
                <td align="left">M_1_PI_H</td>
                <td align="left">Value of 1 / pi</td>
              </tr>
              <tr>
                <td align="left">M_2_PI_H</td>
                <td align="left">Value of 2 / pi</td>
              </tr>
              <tr>
                <td align="left">M_2_SQRTPI_H</td>
                <td align="left">Value of 2 / (square root of pi)</td>
              </tr>
              <tr>
                <td align="left">M_SQRT2_H</td>
                <td align="left">Value of square root of 2</td>
              </tr>
              <tr>
                <td align="left">M_SQRT1_2_H</td>
                <td align="left">Value of 1 / (square root of 2)</td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>
      <div class="refsect1">
        <a id="specification"></a>
        <h2>Specification</h2>
        <p>
            <img src="pdficon_small1.gif" />

            <a href="https://www.khronos.org/registry/cl/specs/opencl-2.0-openclc.pdf#namedest=mathConstants" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="mathFunctions.html"><span class="citerefentry"><span class="refentrytitle">Math Functions</span></span></a>,
            <a class="citerefentry" href="FP_CONTRACT.html"><span class="citerefentry"><span class="refentrytitle">Floating Point Pragma</span></span></a>,
            <a class="citerefentry" href="macroLimits.html"><span class="citerefentry"><span class="refentrytitle">Macros and Limits</span></span></a>
        </p>
      </div>
      <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2015 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
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